package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1. 校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2. 若不符合，返回错误
            return Result.fail("手机号格式错误！");
        }
        //3. 生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4. 保存验证码到Redis, 并设置有效期
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code,
                LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5. 发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1. 校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2. 如果不符合，返回错误
            return Result.fail("手机号格式错误！");
        }
        //3. 从redis中校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        //4. 若不一致，返回错误
        if (cacheCode == null || !code.equals(cacheCode)) {
            return Result.fail("验证码错误！");
        }
        //5. 根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //6. 判断用户是否存在
        if (user == null) {
            //7. 若不存在，创建新用户并保存到数据库
            user = createUserWithPhone(phone);
        }

        //8. 保存用户到 redis
        //8.1 随机生成token, 作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //8.2 将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token,
                BeanUtil.beanToMap(userDTO, new HashMap<>(),
                        CopyOptions.create().setIgnoreNullValue(true).
                                setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString())));
        //8.3 设置token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token,
                LOGIN_USER_TTL, TimeUnit.MINUTES);

        //9. 返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1. 创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2. 保存用户
        save(user);
        return user;
    }
}
